Occasional brief periods of stress: boost the activity of the immune system.
Short-term stress can boost the immune system because it prepares the organism's body to deal with the challenges that can be mental, physical or physiological. The stress can trigger the survival instinct of the organism which in turn boosts the immune system.
Immune system is comprised of cells, tissues and organs that all function together to protect the body against foreign invaders. The main cells involved in the immune system are the white blood cells. Along with these other constituents of immune system are the organs like bone marrow, spleen, various proteins like antibodies, etc.
To know more about stress, here
brainly.com/question/15508591
#SPJ4